xfs: don't verify buffers after IO errors
When we read a buffer, we might get an error from the underlying block device and not the real data. Hence if we get an IO error, we shouldn't run the verifier but instead just pass the IO error straight through. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NMark Tinguely <tinguely@sgi.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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